Physics-Objective Related Question Answers

951. Which is dew point?

Temperature at which given volume of air becomes just saturated with water vapour actually present in it.

952. Which produces more severe burns?

Steam

953. Which factor is not needed to calculate heat lost or gain when there is no change of state?

Relative density

954. What is the maximum density of water?

4°C

955. Transfer of heat takesplace in liquids and gases mostly by?

convection

956. The temperature which is equal in celcius scale and Farenheat scale?

-40

957. The surface of water in a lake is just slowly being frozen. What is the temperature of water at the bottom of the lake?

4°C

958. Paraffin wax contracts on solidication. What is the melting point of wax?

Increase with pressure

959. Alcohol is more volatile than water why?

Because its boiling point is lower than water

960. The snow on the mountains does not melt all at once when it is heated by the sun. Why?

Because it has a high latent heat of fusion

961. What is an ideal gas?

Ideal gas is that which cannot be liquefied

962. The rate of transfer of heat is maximum in?

Radiation

963. What happens when we go up in the atmosphere?

The pressure decreases

964. What is the lowest possible temperature?

-273.16°C

965. What is humidity?

The amount of water vapour in the air is termed as humidity

966. Which liquid is used in a thermometer?

Mercury

967. The change in the direction of light as it passes from one medium to another is called?

refraction

968. The phenomenon of splitting of white light into seven colours is known as?

dispersion

969. Rainbow is formed by?

dispersion

970. When light is dispersed, the colour which is dispersed least is?

red The phenomenon of natural radioactivity was discovered by the scientist:?

971. During dispersion, which colour shows maximum deviation?

violet

972. When light falls on an object, a part of it is reflected in all directions. This process is called?

scattering

973. Light travels in a straight line. This property is known as?

rectilinear propagation of light

974. Materials which transmit almost all light rays through them are known as?

Transparent

975. Materials which transmit only a small part of the light rays are called?

Translucent
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